DMG Beacon Transmission for Millimeter Wave Discovery
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Solution Overview
Problem
Current millimeter waveband wireless communication systems using directional multi-gigabit (DMG) beacons face challenges in achieving high-speed device discovery, particularly when the number of stations to be discovered increases, leading to increased overhead and collision rates during the device discovery process.
Innovation Solution
A wireless communication apparatus that generates transmission frames with sector identifier fields for directional transmissions and indicates quasi-omni transmission capabilities, allowing for efficient directional and quasi-omni transmission modes within the beacon transmission interval, enabling high-speed discovery by optimizing the transmission and reception of DMG beacons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If directional transmission is used for DMG beacon discovery, then discovery speed is improved, but overhead increases when the number of STAs increases
Solution Approach 1:
The patent segments the beacon transmission process into two distinct modes: directional transmission for initial discovery and quasi-omni transmission for subsequent communications. This segmentation allows the system to use directional transmission only when necessary (during discovery phase), thereby reducing overall overhead while maintaining high discovery speed. The frame structure includes a specific field to indicate which transmission mode is being used, enabling efficient mode switching.
Solution Approach 2:
The patent implements dynamic transmission mode selection where the AP can switch between directional and quasi-omni transmission modes based on the operational phase. During the beacon transmission interval, directional transmission is used for discovery, and the system dynamically transitions to quasi-omni mode for data transmission. This dynamic adaptation reduces overhead by avoiding continuous directional sweeping while maintaining fast discovery capability.
2Quantity of substance
If multiple STAs are discovered using DMG beacons, then discovery completeness is improved, but collision rate increases
Solution Approach 1:
The patent introduces a quasi-omni transmission mode as an intermediary between directional transmission and omnidirectional transmission. This intermediary mode provides broader coverage than directional transmission, allowing multiple STAs to be discovered simultaneously with reduced collision probability. The quasi-omni beacons act as mediators that can be received by multiple STAs in different directions without causing the severe collisions that occur in traditional directional sweeping protocols.
Solution Approach 2:
The patent changes the transmission parameter from highly directional (narrow beam) to quasi-omni (wider beam) depending on the operational context. By adjusting the beam width parameter dynamically, the system can accommodate multiple STAs during discovery while maintaining reliable communication. This parameter change reduces collision rate by spreading the transmission energy over a wider angular range, allowing multiple receivers to capture the signal simultaneously.
Data Source
AI summary
A wireless communication apparatus comprising: a frame configuration circuit that generates a transmission frame including DMG beacons, wherein sector ID fields in SSW fields included in the respective DMG beacons indicate one or more transmit sectors used for directional transmissions of the respective DMG beacons, and a field different from the sector ID field included in each DMG beacon indicates whether or not there is quasi-omni transmission; and a transmission wireless circuit that performs, by using the transmit sector indicated by the sector ID field, directional transmission on a first DMG beacon that is included in the DMG beacons and in which the field different from the sector ID field indicates non-quasi-omni transmission and performs quasi-omni transmission on a second DMG beacon that is included in the DMG beacons and in which the different field indicates quasi-omni transmission, in a BTI.